Carriage-feed mechanism for type-writers.



PATBNTED SEPT.- 22, 190s.v 3.. s. SHIMER. CARRIAGE FEED MECHANISM FOR TYPE WRITERS;

APBLIOATIOII FILED-MAB. 25, 1903.

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No. 739,728. PATENTBD'SEPT. 22, 1903.

' E. s. 511mm.

CARRIAGE FEED MECHANISM FOR TYPE WRITERS.

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UNITED STATES Patented September 22, 1903.

PATENT, OFFICE.

ELMER S. SHIMER, OF MILTON, PENNSYLVANIA.

SPECIFICATION forming part of Letters Patent No. 739,728, dated September 22, 1903.

Application filed March 25, 1903. iSerial No. 149,554. (No model.)

To whom it may concern:

- Be it known that LELMER S. SEIMER, a citizen of the United States, residing at Milton, in the county of Northumberland and State of Pennsylvania, have invented new and useful Improvements in Carriage-Feed Mechanisms for Type-W'riters, of which the following is a specification.

My invention relates to improvements in carriage-feed mechanism for type-writers of the Shimer type havinga vertical escapementshaft.

The simple and novel construction employed by me in carrying out my invention is fully described and claimed in this specification and illustrated in the accompanying drawings, forming a part thereof, in which- Figure 1 is a rear elevation of a type-writing machine equipped with my device and with parts of the frame broken away. Fig. 2 is a perspective of my device shown in combination with fragments of the machine and the key-lever depressed. Fig. 3 is a bottom plan of the machine with my device attached.

Like numerals of reference designate like parts in the different views of the drawings.

The numeral 1 designates a vertical escapement-shaft, which bears a pinion 1" on its upper end, located to mesh with a rack 2, mounted on the carriage, as is common in the art. The shaft 1 is supported in bearings seated in cross-bars 3 and 4, extending across the upper and lower parts, respectively, of the frame of the machine.

Rigidly secured on the lower end of the shaft 1 is an escapement 5, having teeth 5 thereon. Extending transversely the base of the frame of the machine and. supported on bearings 6, seated in the sides 7 of the base, isa shaft 8, carrying two crank-arms 9, mounted adjacent to the opposite ends of said shaft, and just outside the set of key-levers 10 of the machine, which extend almost horizontally, are fulcrumed at their rear ends at 11 and are located just above the shaft 8. An elongated crank-pin 12 or cross-bar connects the crank-arms 9, which are inclined upwardly about forty-five degrees to the plane of the base, thereby bringing the bar 12 in position to be engaged by every one of the key-levers 10 when depressed.

To restore the rock-shaft 8 to its initial position after each displacement, a long coiled spring 13 is provided and is connected at one end to the base and at the other end to an apertured arm-14 in the form of a screw-eye seated in the rock-shaft 8 and normally extending in alinement with the direction of the spring 13. By the arrangement just described the resistance of the spring 13 increases with the displacement of the bar 12 from its initial position.

Mounted transversely the shaft 8, adjacent to the ratchet and normally out of engagement with the escapement 5, is a fixed pawl 15, having a head 15 and a tail 15 A movable pawl 16, normally in engagement with the escapement 5, is provided and is pivoted at one end on a pin 17, seated in the tail of the pawl 15. Two lugs 17 and 17, formed on the pawl 15, are locatedron opposite sides ofvthe pawl 16 to serve as stops to limit the movement thereof. A coiled spring 18, connected at one end to the movable pawl 16 and at the other end to the shaft 8, serves to actuate the pawl 16 to operate the escapement.

From the construction described it follows that when one of the key-levers 10 is depressed it will engage the cross-bar 12 and throw the rock-shaft 8, which will in turn disengage the movable pawl 16 from one tooth 5 of the escapement 5 and bring the pawl 15 into engagement therewith, thereby permitting the spring 18 to advance the pawl 16. When the keylever is released, the spring 13 will restore the shaft 8 to its initial position, thereby disengaging the pawl 15 from the escapement and permitting it to turn until the next tooth 5 on the escapement engages the pawl 16 and carries it'back until the pawl comes in contact with the stop 17 By this operation the carriage is fed along. y

I do not wish to be limited as to details of constuction, as these may be modified in many particulars without departing from the spirit of my'invention.

Having thus described my invention, What I claim as new, and desire to secure by Letters Patent, is-

1. In a carriage-feed mechanism, the combination of a set of key-levers fulcrumed'at their rear ends, a rock-shaft located beneath said key-levers, a crank-pin carried by said ICO rock-shaft and extending transversely said key-levers in position to be engaged by each and every one of them on being depressed, a shaft bearing an escapement located beneath said key-levers, a pawl rigidly attached intermediate its ends to said rock-shaft, a pawl pivoted at one end to the rear end of said first-mentioned pawl, said pawls being located to engage said escapement-wheel, stops located to limit the movement'of said movable pawl, aspring connected to said movable pawl, and a spring connected to said rockshaft to restore it to its initial position after displacement, substantially as described.

2. In a carriage-feed mechanism, the combination of a set of key-levers, a crank-shaft located to be engaged and operated by each of said key-levers, a radially-extending arm carried by said rock-shaft, and a coiled spring attached to said arm and normally extending in alinement therewith when said rock-shaft is in its initial position, whereby said rockshaft is restored to its initial position after displacement, substantially as described.

3. In a carriage-feed mechanism for typewriters, the combination of the set of pivoted key-levers, the rock-shaft carrying an elongated crank-pin located in position to be engaged by each of said key-levers when operated, the escapement-wheel and its shaft, the pawl rigidly attached intermediate its ends to said rock-shaft and located to engage said escapement, the pawl pivoted to the tail or rear end of said first-mentioned pawl and located to engage said escapement, the spring connected to the pivoted pawl, the stops to limit the movement of said pivoted pawhand means for restoring said rock-shaft to its initial position after displacement, substantially as described.

4. In a carriage-feed mechanism for typewriters, the combination of the pivoted keylevers, the rock-shaft bearing an elongated crank-pin located to be engaged by said levers when operated, the shaft bearing an escapement-wheel, the fixed pawl rigidly attached intermediate its ends to said rockshaft, the pivoted pawl pivotally connected to the tail of said fixed pawl, said pawls engaging said escapement, means for actuating said pivoted pawl, and means for restoring said rock-shaft to its initial position after displacement, substantially as described.

5. In a carriage-feed mechanism for typewriters, the combination-of the pivoted keylevers, the rock-shaft bearing an elongated crank located to be engaged by said levers when operated, the shaft carrying an escapement-wheel, the fixed pawl rigidly secured to said rock-shaft, the pivoted pawl, said pawls being located to engage said escapement, means for actuating said pivoted pawl, the radially-extending arm carried by said rockshaft and the coiled spring attached to said arm and normally extending in alinement therewith when said rock-shaft is in its initial position, substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

ELMER S. SHIMER.

Witnesses:

W. H. BECK, O. E. RAUP. 

